Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Psoriasis severity
Systematic review	Number of people in analysis not reported, psoriasis severity not reported 9 RCTs in this analysis	Psoriasis severity scores 3–8 weeks with vitamin D derivatives with potent topical corticosteroids	SMD +0.06 95% CI –0.12 to +0.24 Significant statistical heterogeneity reported among trials (P <0.01)		Not significant